diff --git a/containers/buildkite-premerge-windows/Dockerfile b/containers/buildkite-premerge-windows/Dockerfile
index b1ef40d..e187304 100644
--- a/containers/buildkite-premerge-windows/Dockerfile
+++ b/containers/buildkite-premerge-windows/Dockerfile
@@ -1,6 +1,7 @@
 # escape=`
 
 # Agent image for LLVM org cluster.
+# maybe mcr.microsoft.com/windows/servercore:ltsc2022?
 FROM mcr.microsoft.com/dotnet/framework/sdk:4.8-windowsservercore-ltsc2019
 
 # Restore the default Windows shell for correct batch processing.